Li7P3S11 electrolyte for all-solid-state lithium-ion batteries: structure, synthesis, and applications

Because of the high ion conductivity (10−2 S cm−1) comparable with liquid electrolytes at room temperature, Li7P3S11, one of the most important solid state electrolytes (SSEs), has attracted significant attention for applications in all-solid-state lithium batteries (ASSLBs). The development of Li7P3S11 has progressed impressively in recent years. A fundamental understanding of Li7P3S11 SSE from its crystal structure and ion conductivity to practical applications is critical for the development of Li7P3S11 SSE based ASSLBs. In light of that, this review presents an overview of the Li7P3S11 SSE. The review addresses 1) the crystal structure and Li+ diffusion mechanism; 2) developed synthesis methods and corresponding crystal growth mechanisms; 3) challenges and strategies of Li7P3S11 SSE in practical applications. Finally, remaining challenges and future perspectives are highlighted.